Nenad Krstic  had a season-high 20 points in 38 minutes but he admitted afterward he wasn’t satisfied with his defense in a 108-103 loss to the Clippers at TD Garden.
Krstic and the Celtics  had tremendous difficulty early on stopping DeAndre Jordan and the rest of the Clippers front court, which scored early and often en route to shooting 68 percent in the first half and building a 60-42 halftime lead.
Krstic came to Boston on deadline day, Feb. 24 with Jeff Green  in exchange for the defensive-minded Kendrick Perkins  and Nate Robinson . Krstic is still trying to get accustomed to thinking the Celtics’ way – which begins and ends with defense.
“I just need to get better, need to be more focused,” Krstic said. “Sometimes, I’m a lost a little bit because of a different style of playing. Oklahoma is still in my head. I’m just really trying to get adjusted. It just takes time, especially when you play games. It’s different in practice but in games you just have to react.
“It’s going to come. I just need to get used to more of the guys. Sometimes, I’m trying to do too much, over help and have a couple of stupid fouls, too. I know I scored 20 points but I need to focus on my defense and help the team.”
Doc Rivers  still has confidence in his new starting center.
“Krstic overall is playing pretty well,” Rivers said. “He’s got to hold his ground a little bit. The problem we had going into the game, and I’m kind of kicking myself, is I told our bigs — the two bigs that we have right now due to all the injuries — you can’t get in foul trouble. “So if it comes down to you getting out of the way, you almost had to. Because we couldn’t afford Kevin [Garnett ] or Nenad in foul trouble.
“And it actually happened anyway.”
Krstic said he’s confident the defensive part of his game will come but it will take time.
“Just not having been on the court at the same time together is the problem,” Krstic said of the chemistry with his new teammates. “Sometimes, especially in the first half, our second unit is almost all new guys, and we’re not used to each other. I think that was a problem tonight, we just haven’t spent too much time together playing. It’s going to take some time, but obviously with this team, we pick it up really quickly.”